How can I add calcium without raising PH? - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 03-12-2007, 06:37 PM Thread Starter
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How can I add calcium without raising PH?

Everytime I add calcium, the PH goes up a little.. Is it possible to have it not go up...
I have added gypsum (calcium sulfate).

I just added limestone (calcium carbonate, i think).. I know this will raise PH too.

I'm actually surpised on how much plants need calcium.


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post #2 of 7 (permalink) Old 03-12-2007, 06:53 PM
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My understanding is that calcium will only raise Gh and therefore shouldn't affect Ph. The carbonate in the calcium carbonate will affect Kh and Ph. Maybe something else is going on?

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post #3 of 7 (permalink) Old 03-12-2007, 08:06 PM
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Calcium nitrate or calcium chloride will raise the calcium levels and leave the kH alone.
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post #4 of 7 (permalink) Old 03-12-2007, 09:45 PM Thread Starter
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I should test this stuff in a jar first. thanks.


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post #5 of 7 (permalink) Old 03-13-2007, 04:20 AM Thread Starter
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Limestone (CaCO3) lowers PH... fyi..
I guess it's the CO3 that did it..


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post #6 of 7 (permalink) Old 03-23-2007, 02:35 PM
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Quote:
Originally Posted by mistergreen View Post
Limestone (CaCO3) lowers PH... fyi..
I guess it's the CO3 that did it..
CaCO3 increases pH to 8 9
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post #7 of 7 (permalink) Old 03-23-2007, 02:38 PM
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Quote:
Originally Posted by mistergreen View Post
Everytime I add calcium, the PH goes up a little.. Is it possible to have it not go up...
I have added gypsum (calcium sulfate).
Then it is not Calcium sulfate CaSO4. Calcium sulfate does not change pH.
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